Messung der dynamischen Grenzflächen‐spannung im System wäßrige Tensidlösung/organisches Lösungsmittel
作者:
Reinhard Miller,
Michele Ferrari,
Francesca Ravera,
Libero Liggieri,
Sergej A. Zholob,
Valentin B. Fainerman,
A. Wilhelm Neumann,
期刊:
Chemie Ingenieur Technik
(WILEY Available online 1998)
卷期:
Volume 70,
issue 1‐2
页码: 89-99
ISSN:0009-286X
年代: 1998
DOI:10.1002/cite.330700107
出版商: WILEY‐VCH Verlag
数据来源: WILEY
摘要:
AbstractDynamic interfacial tensions provide insight into the mechanism of surfactant adsorption at and transport across an interface. As an example, the adsorption kinetics and the distribution of a surfactant (alkyl dimethyl phosphine oxide with an alkyl chain length of 13) was studied at the water/hexane interface. The drop shape method used yields dynamic interfacial tensions that pass through a minimum under certain conditions. Model calculations show that depth, width and location of the minimum and the equilibrium adsorption state depend on several parameters: the diffusion coefficients of the surfactant in the two liquids, the distribution coefficient between the phases, the liquids volume ratio, and the total surfactant concentration in the system. One can conclude that surfactants are often soluble in both liquid phases, and transfer across the interface between them has to be considered. If a surfactant is to be optimized in a liquid‐liquid system to achieve maximum efficiency of a technological process, the surfactant distribution coefficient plays a significant rol
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